Magnetic Force on a Moving Proton
A proton enters a uniform magnetic field with velocity components $$v_x = 3.0 \times 10^5$$ m/s and $$v_y = 4.0 \times 10^5$$ m/s. If the magnetic field is $$\vec{B} = 0.50$$ T points in the $$+z$$ direction, what is the magnitude of the magnetic force on the proton?
A
4.0×10⁻¹⁴ N
B
1.2×10⁻¹³ N
C
3.5×10⁻¹³ N
D
5.0×10⁻¹³ N
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